所以我听说如果我将2个字符串与==进行比较,那么只有当它们都引用相同的对象/实例时我才会得到回报.这是字符串.布尔人怎么样？
public class HelloWorld extends HttpServlet{
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException,IOException{
**response.setContentType("text/html");**
PrintWriter pw = response.getWriter();
pw.println("<html>");
pw.println("<head><title>Hello World</title></title>");
pw.println("<body>");
pw.println("<h1>Hello World</h1>");
pw.println("</body></html>");
}
}
我在使用 react 钩子时对到达路由器有一个小问题。我需要在浏览器中捕获路由的参数，我尝试使用到达路由器网络中的本机文档的道具，但这并没有给我参数，路由是这样的：
http://localhost:8080/home?init=true
如何捕获该变量“init”？
我正在使用Spring 3.1并编写了我的DAO和服务层(事务性).
但是在特殊情况下,为了避免延迟初始化异常,我必须创建一个spring mvc请求处理程序方法@transactional.但它没有将事务附加到该方法.方法名称是ModelAndView home(HttpServletRequest请求,HttpServletResponse响应). http://forum.springsource.org/showthread.php?46814-Transaction-in-MVC-Controller 从这个链接看来,无法将事务(默认情况下)附加到mvc方法.该链接中建议的解决方案似乎适用于Spring 2.5(覆盖handleRequest).任何帮助都会得到真正的认可.谢谢
@Controller
public class AuthenticationController {
@Autowired
CategoryService categoryService;
@Autowired
BrandService brandService;
@Autowired
ItemService itemService;
@RequestMapping(value="/login.html",method=RequestMethod.GET)
ModelAndView login(){
return new ModelAndView("login.jsp");
}
@RequestMapping(value="/home.html",method=RequestMethod.GET)
@Transactional
ModelAndView home(HttpServletRequest request, HttpServletResponse response){
List<Category> categories = categoryService.readAll();
request.setAttribute("categories", categories);
List<Brand> brands = brandService.readAll();
request.setAttribute("brands", brands);
List<Item> items = itemService.readAll();
request.setAttribute("items", items);
Set<Image> images = items.get(0).getImages();
for(Image i : images ) {
System.out.println(i.getUrl());
}
return new ModelAndView("home.jsp");
}
我有一个类，它或多或少是一个围绕双精度的包装类。当我通过 jackson 序列化我的课程时，我会收到类似：{“value”：123.0} 的信息。我基本上想要发生的是，杰克逊只给了我 123.0.0.0。如果我可以扩展 Number，我的问题将得到解决，但由于我已经扩展了另一个类，这不是一个选项。
班级：
@JsonIgnoreProperties(ignoreUnknown = true)
@SuppressWarnings("unused")
public class TestValue {
@JsonProperty
private final Double d;
public TestValue(Double d) {
this.d = d;
}
}
结果是：
{
"d" : 123.0
}
什么会像预期的那样工作：
public class TestValue extends Number {
private final Double d;
public TestValue(Double d) {
this.d = d;
}
public double doubleValue() {
return d;
}
public float floatValue() {
return d.floatValue();
}
public int intValue() {
return d.intValue();
}
public long longValue() {
return …我正在为SOAP Web服务生成SOAP客户端.我创建了Java存根,当我尝试执行时出现错误:
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException:`
我尝试运行InstallCert,但即使在那之后也无法运行.
INFO: The cipher suite filters have not been configured, falling back to default filters.
4 Nov, 2011 1:07:52 AM org.apache.cxf.transport.https.SSLUtils getCiphersFromList
INFO: The cipher suites have been set to SSL_RSA_WITH_RC4_128_MD5, SSL_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_128_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA, SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA, SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA, SSL_RSA_WITH_DES_CBC_SHA, SSL_DHE_RSA_WITH_DES_CBC_SHA, SSL_DHE_DSS_WITH_DES_CBC_SHA, SSL_RSA_EXPORT_WITH_RC4_40_MD5, SSL_RSA_EXPORT_WITH_DES40_CBC_SHA, SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA, SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA, TLS_KRB5_WITH_RC4_128_SHA, TLS_KRB5_WITH_RC4_128_MD5, TLS_KRB5_WITH_3DES_EDE_CBC_SHA, TLS_KRB5_WITH_3DES_EDE_CBC_MD5, TLS_KRB5_WITH_DES_CBC_SHA, TLS_KRB5_WITH_DES_CBC_MD5, TLS_KRB5_EXPORT_WITH_RC4_40_SHA, TLS_KRB5_EXPORT_WITH_RC4_40_MD5, TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA, TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5.
4 Nov, 2011 1:07:53 AM org.apache.cxf.phase.PhaseInterceptorChain doIntercept
INFO: Interceptor has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: Could not send Message. …有人可以向我解释为什么结果是6？谢谢
String[] s = { "A", "B", "C", "D" };
String b = "ABRACADABRA";
int i = s.length - 1;
System.out.print( b.indexOf( s[ i ] ) );
我知道s的长度是4,所以i = 3,但那么s [i]是什么意思？
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